Electric Vehicle Stop Lamp Control via Regenerative Torque Thresholds
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Solution Overview
Problem
Existing stop lamp control systems in electric vehicles with regenerative braking systems struggle to accurately turn on and off brake lamps in compliance with regulatory deceleration thresholds, affecting driver attention and comfort for following vehicles.
Innovation Solution
A stop lamp lighting control device that calculates regenerative torque thresholds based on vehicle speed and weight, using a first and second regenerative torque threshold for turning on and off the stop lamp, and a third threshold for controlled turn-off after a specific period, ensuring compliance with regulatory deceleration thresholds and minimizing driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stop lamp is turned on when deceleration exceeds -1.3 m/s² to alert succeeding vehicles, then safety and attention alerting are improved, but the stop lamp may remain on too long causing inconvenience to following drivers
Solution Approach 1:
The patent divides the single deceleration threshold into two distinct thresholds: a first deceleration threshold (-1.3 m/s²) for turning on the stop lamp and a second deceleration threshold (-0.7 m/s²) for turning it off. This segmentation allows the stop lamp to be activated during significant deceleration events for safety while automatically turning off during normal deceleration to avoid inconveniencing following drivers.
Solution Approach 2:
The patent implements dynamic threshold adjustment based on vehicle speed. The first and second deceleration thresholds are not fixed values but are dynamically determined according to the current vehicle speed, allowing the stop lamp control to adapt to different driving conditions and maintain optimal safety and comfort across various operating ranges.
2Reliability
If the stop lamp control follows the revised regulation strictly, then regulatory compliance is improved, but driver feelings and comfort may be compromised
Solution Approach 1:
The patent implements dynamic threshold adjustment based on vehicle speed. The first and second deceleration thresholds are not fixed values but are dynamically determined according to the current vehicle speed, allowing the stop lamp control to adapt to different driving conditions and maintain optimal safety and comfort across various operating ranges.
Solution Approach 2:
The patent changes the control parameters from fixed deceleration thresholds to speed-dependent dynamic thresholds. By adjusting the threshold values based on vehicle speed, the system maintains regulatory compliance while adapting to different driving scenarios to improve driver comfort and reduce unnecessary stop lamp activation.
Data Source
AI summary
A stop lamp lighting control device for an electric vehicle having an electric regenerative braking system, includes, a first calculation unit (11) that converts a first deceleration threshold value to a first regenerative torque threshold value with a curb weight, a second calculation unit (12a) that converting a second deceleration threshold value to a second regenerative torque threshold value with a gross vehicle weight, a third calculation unit (12b) that calculates a third regenerative torque threshold value, and a determination unit (13) that controls the stop lamp (3) to be turned on when a regenerative torque value exceeds the first regenerative torque threshold value, the stop lamp to be turned off when the regenerative torque value is equal to or smaller than the second regenerative torque threshold value, and the stop lamp to be turned off when a given state continues.